Notes Science

Essential Question(s)What is gravity? What is mass? How does mass anddistance affect gravitational pull?

Tennessee SPI Objective:Determine the relationship among the mass of objects, the distance between these objects, and the amount of gravitational attraction.

Check for UnderstandingIdentify factors that influence the amount of gravitational force between objects

Instructions1) First click on "View" from the top-menu bar.2) Then click on "Slide Show" from the drop-down menu.3) Then use the right-arrow button on your keyboard to advance through this presentation.

SPI 0807.12.5 Gravity-Mass and Distance

Gravity is a “mysterious” force found everywhere in the universe that pulls particles of matter togetherKey Concept: Gravity is a pulling force (not a pushing force)

Law of Universal GravitationF.Y.I -Isaac Newton is credited with defining this lawThe law states that gravity is everywhere in our universe, and that its attractive force changes based on mass and distance. Summary: Every particle of matter is attracted to every other particle of matter.

SPI 0807.12.5 Gravity-Mass and DistanceNotes Science

Mass Affects Gravity Objects with more mass have stronger gravity Look below: (bowling ball and a baseball) both objects are

made of matter, so both objects have gravity. So both objects are being pulled towards each other. Yet the ball with more mass (bowling ball) has more gravity. Therefore its pull is stronger (view animation)

Diagram 01

Mass Affects Gravity The example of a bowling ball and a baseball is similar to the

gravity effect with a planet and a moon

Earth and the Moon

Diagram 01

Diagram 02

Notes SPI 0807.12.5 Gravity-Mass and Distance Science

Mass Affects Gravity Look below: (baseball and a golf ball) both objects are made

of matter, so both objects have gravity. So both objects are being pulled towards each other. Yet the ball with more mass (baseball) has more gravity. Therefore its pull is stronger (view animation) This is similar to the gravity effect with a moon and a asteroid

Distances Affects Gravity Effect of gravity increases when objects are closer together. Effect of gravity decreases when objects are farther apart. In diagram 01 the two soccer balls are 5m apart. In diagram 02 the two soccer balls are 10m apart.

Notes

5 meters

10 meters

Gravitation attraction is greatest when they are closer together.

SPI 0807.12.5 Gravity-Mass and Distance Science

Diagram 02

Diagram 01

Gravity and the Theory of RelativityAlbert Einstein theorized that mass warps/bends/curves space and this warping explains the force we call gravity

SPI 0807.12.5 Gravity-Mass and Distance

Watch both of these Youtube videos: Write down three things that catch your attention, and be ready to share afterwards.(1)Link: Curvature of Space-Time (34 sec)(2)Link: How Gravity Really Works (1 min 45 sec)

Notes Science

1) What is the name of the law about gravity? The law of…A) …Conservation of Mass or B) …Universal Gravitation

(2) All matter in the universe attracts other matter by? A) A “pushing force” or B) A “pulling force”

(3) The strength of gravity depends on the ______ of the objectsA) Masses or B) Shape

4) Effect of gravity depends on the _____ between the objects.A) Energy or B) Distance5) What did Einstein say about mass and gravity?A) That mass warps space or B) Mass and gravity are the same

Quick Review

SPI 0807.12.5 Gravity-Mass and Distance Science

Here is an example of a question you might see on a quiz or test.

Questions Science SPI 0807.12.5 Gravity-Mass and Distance

Here is an example of a question you might see on a quiz or test.

Questions Science SPI 0807.12.5 Gravity-Mass and Distance

Here is an example of a question you might see on a quiz or test.

Questions Science SPI 0807.12.5 Gravity-Mass and Distance

Here is an example of a question you might see on a quiz or test.

Questions Science SPI 0807.12.5 Gravity-Mass and Distance

Here is an example of a question you might see on a quiz or test.

Questions Science SPI 0807.12.5 Gravity-Mass and Distance